US10823508B2 - Helically coiled heat exchanger - Google Patents

Helically coiled heat exchanger Download PDF

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Publication number
US10823508B2
US10823508B2 US16/093,182 US201716093182A US10823508B2 US 10823508 B2 US10823508 B2 US 10823508B2 US 201716093182 A US201716093182 A US 201716093182A US 10823508 B2 US10823508 B2 US 10823508B2
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Prior art keywords
tube
heat exchanger
spacer
tube layer
medium
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US16/093,182
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US20190120559A1 (en
Inventor
Manfred Steinbauer
Christiane Kerber
Jurgen SPREEMANN
Konrad Braun
Thomas ACHER
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Linde GmbH
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Linde GmbH
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Assigned to LINDE AKTIENGESELLSCHAFT reassignment LINDE AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ACHER, Thomas, BRAUN, KONRAD, STEINBAUER, MANFRED, KERBER, CHRISTIANE, SPREEMANN, JURGEN
Publication of US20190120559A1 publication Critical patent/US20190120559A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/02—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled
    • F28D7/024—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled the conduits of only one medium being helically coiled tubes, the coils having a cylindrical configuration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/02—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled
    • F28D7/022—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled the conduits of two or more media in heat-exchange relationship being helically coiled, the coils having a cylindrical configuration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/007—Auxiliary supports for elements
    • F28F9/013—Auxiliary supports for elements for tubes or tube-assemblies
    • F28F9/0132—Auxiliary supports for elements for tubes or tube-assemblies formed by slats, tie-rods, articulated or expandable rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/22—Arrangements for directing heat-exchange media into successive compartments, e.g. arrangements of guide plates

Definitions

  • the invention relates to a helically coiled heat exchanger.
  • a heat exchanger of said type serves for the indirect exchange of heat between at least one first and one second medium and has a shell space, for accommodating the first medium, and a tube bundle, which is arranged in the shell space and which has a plurality of tubes for accommodating the second medium, wherein those tubes are helically coiled onto a core tube of the heat exchanger in multiple tube layers.
  • the first medium is distributed over the tube bundle as uniformly as possible in order to be able to ensure an efficient exchange of heat.
  • the fluid first medium conducted on the shell side is guided outward to the tube layers which are the outer tuber layers (in the radial direction of the tube bundle) owing to various effects in the shell space.
  • the centrifugal force which, owing to the helical coiling of the individual tubes of the tube bundle of the heat exchanger, acts on those parts of the first medium which flow along the surfaces of the tubes.
  • said parts of the first medium are forced outward toward the outer tube layers in the radial direction of the tube bundle.
  • At least one spacer having a flow-guiding means which is configured to divert a part of the first medium, which part flows along the first (outer) tube layer in the shell space, into the direction of the radially further inwardly situated second tube layer.
  • the invention is first described on the basis of a further outwardly situated (first) tube layer and the adjacent (second) tube layer situated therebelow. It is not absolutely necessary that the further outwardly situated tube layer is the outermost tube layer. It is of course possible for a multiplicity of tube layers to be provided in the heat exchanger according to the invention (see also below), wherein then, between in each case two (radially) adjacent tube layers, there may be provided in each case one or more spacers with said flow-guiding means, wherein the flow of that part of the first medium of concern is always diverted from the in each case radially further outwardly situated (first) tube layer to the radially further inwardly situated adjacent (second) tube layer.
  • the spacer elements with said flow-guiding means are in this case provided such that the most uniform possible distribution of the first medium over the tube bundle is achieved (in relation to the total length of the tube bundle along the longitudinal axis of the shell/core tube of the heat exchanger). In some cases, this may also mean that spacers of said type are provided not between all the tube layers but only between certain tube layers (according to the non-uniform distribution of the first medium which is to be expected). Between the remaining tube layers, it is then possible to provide for example conventional spacers, or spacers which do not exhibit the flow-diverting effect according to the invention or exhibit said effect to a considerably smaller extent.
  • the non-uniform distribution in favor of the outer tube layers is advantageously counteracted, so that, as a result, the shell-side coolant or the first medium is distributed better and, correspondingly, the performance of the helically coiled heat exchanger is improved.
  • said means is formed by an end side of the at least one spacer or has such an end side.
  • said end side is an integral constituent part of the at least one spacer or is a side of the spacer formed in one piece with the spacer.
  • said end side connects in particular a front side, averted from the core tube, of the spacer to a rear side, facing the core tube, of the spacer.
  • the end side thus extends substantially along the radial direction of the tube bundle and, in this case, has in particular an inclination with respect to the radial direction.
  • said end side may also extend sectionally between in each case two adjacent tube sections of the first tube layer, wherein these sections of the end side may each belong to a projection of the spacer element, wherein these projections are each situated between two adjacent tube sections or tube coils of the first tube layer and each project in the radial direction of the tube bundle from an edge section of a base of the at least one spacer.
  • the vertical spacing of the tube windings is thus fixed in the respective tube layer.
  • said end side of the at least one spacer has an inclination toward the second tube layer, or an inclination with respect to a tangential direction of the tube sections of the second tube layer which bear against the spacer, such that that part of the first medium which flows along the tube of the first tube layer and against the end side of the at least one spacer is diverted by the end side into the direction of the second tube layer.
  • the core tube extends along a longitudinal axis which is preferably oriented so as to be parallel to the vertical in relation to a heat exchanger arranged as intended.
  • the heat exchanger furthermore has a shell which surrounds the shell space and which extends coaxially with respect to the core tube along said longitudinal axis.
  • the at least one spacer or said flow-influencing end side of the spacer extends along the longitudinal axis.
  • said means of the at least one spacer is formed by at least one guiding element, or has at least one such guiding element, for example in the form of at least one baffle plate, which is fixed to a base of the spacer, which base extends along the longitudinal axis and via the first tube layer is supported against the second tube layer.
  • that base thus performs the function of establishing the spacing between the individual tube layers or the dissipation of the load of the in each case outer tube layer over the tube layer situated therebelow, while the at least one guiding element performs merely a flow-guiding function.
  • the at least one guiding element forms an impact surface against which said part of the first medium to be diverted strikes, wherein that impact surface in turn has an inclination toward the second tube layer (or an inclination with respect to a tangential direction of the tube sections of the second tube layer which bear against the spacer) such that that part of the first medium which flows along the tube of the first tube layer and against the impact surface is diverted by the impact surface into the direction of the second tube layer.
  • the guiding element extends sectionally between adjacent tube sections of the second tube layer or of the radially further inwardly situated tube layer.
  • the at least one spacer may also have multiple guiding elements, which are fixed to the base along the longitudinal axis, such that a gap is present between in each two guiding elements which are adjacent in the direction of the longitudinal axis.
  • the individual guiding elements then extend sectionally between in each case two associated tube sections of the second tube layer or project into an intermediate space between the two tube sections.
  • the at least one guiding element (or the multiple guiding elements) is, in relation to the flow direction of said part of the first medium, arranged on a section of the base of the at least one spacer, which section is situated upstream or downstream, in particular on an end side of the base, which end side connects a front side of the base to a rear side of the base, with the rear side facing the core tube.
  • said means is formed by a plurality of channels, which are formed in the spacer, or has such channels.
  • the channels each extend inwardly along the radial direction, wherein they descend inwardly such that a part of the first medium, which part flows along the first tube layer in particular from the top downward, can pass into the channels and, therein, is deflected inward toward the second tube layer.
  • the channels are formed for example on an end side of the respective spacer, against which end side the first medium, flowing along the first tube layer or along the tube of the first tube layer, flows, or on which end side the first medium flows down from the top downward.
  • said means in particular the at least one guiding element
  • said means may also be configured to divert a part of the first medium, which part flows along the longitudinal axis or along the first tube layer in the shell space from the top downward, into the direction of the second tube layer in another manner.
  • a spacer may thus have one, two or three of said components for flow diversion.
  • the heat exchanger has a plurality of spacer elements between the first and the second tube layer, wherein the spacer elements each have a flow-guiding means which is configured to divert a part of the first medium, which part flows along the first tube layer in the shell space, into the direction of the second, radially further inwardly situated tube layer.
  • said means it is in turn possible for said means to be formed according to one of the embodiments described or claimed herein.
  • the heat exchanger has spacer elements between multiple or between all the adjacent tube layers, wherein the respective spacer element preferably has a flow-guiding means which is configured to divert a part of the first medium, which part flows along an outer tube layer of the two adjacent tube layers in the shell space, into the direction of the radially further inwardly situated tube layer of the two adjacent tube layers.
  • said means it is in turn possible for said means to be formed according to one of the embodiments described or claimed herein.
  • the number of spacers arranged between the adjacent tube layers is constant, wherein in each case multiple spacers are arranged one on top of the other in a radial direction of the tube bundle for the purpose of supporting the tube layers. In this way, the weight of all the tube layers can be supported via the spacers without damaging the tubes of individual tube layers.
  • FIG. 1 shows a partially sectional view of a helically coiled heat exchanger according to the invention with flow-influencing spacers;
  • FIG. 2 shows an embodiment of the spacers according to the invention, with the respective spacer having an inclined end side for diverting the first medium;
  • FIG. 3 shows a further embodiment of the spacers according to the invention, with the respective spacer having a guiding element for diverting the first medium;
  • FIG. 4 shows a modification of the embodiment shown in FIG. 3 ;
  • FIG. 5 shows a further embodiment of spacers according to the invention, which have channels for diverting the first medium.
  • FIG. 1 shows a helically coiled heat exchanger 1 .
  • This has a shell 10 which encloses a shell space M of the heat exchanger 1 .
  • the shell 10 extends along a vertical longitudinal or cylinder axis L and surrounds a tube bundle 2 which is arranged in the shell space M and which, in relation to the longitudinal axis L, is to be acted on by a fluid first medium S from above such that said medium to come into indirect heat-exchanging contact with at least one second medium S′ conducted in the tube bundle 2 .
  • the tube bundle 2 is formed from multiple tubes 20 , which are each helically coiled around a core tube 21 such that the tube bundle has multiple tube layers 201 , 202 , . . .
  • the core tube 21 extends coaxially with respect to the shell 10 , wherein the radial direction R of the tube bundle 2 is perpendicular to the longitudinal axis L or the core tube 21 and points outward to the shell 10 .
  • the tube layers 201 , 202 , . . . thus formed and arranged one on top of the other in the radial direction R of the tube bundle 2 are supported against one another via spacers 6 , which extend along the longitudinal axis L and which are preferably formed as webs, such that the loads of the tube layers 201 , 202 , . . . are introduced into the core tube 21 via the spacers 6 .
  • the tube bundle 2 may be surrounded by a so-called jacket 3 in order to prevent the first medium S from being able to flow past the tube bundle 2 on the outside.
  • the first medium S may, for example, be fed into the shell space M via a connecting piece 101 provided laterally on the shell 10 , and extracted from the shell space M via a further connecting piece 102 provided laterally on the shell 10 .
  • a distribution device (not shown in more detail here), for example of a known type, to be provided in the shell space M above the tube bundle 2 .
  • the second medium S′ conducted in the tube bundle 2 may be introduced into the tube bundle 2 via a connecting piece 103 provided on the shell 10 , and extracted from the tube bundle 2 via a further connecting piece 105 provided on the shell 10 .
  • the tubes 20 may be gathered into corresponding groups 104 , which groups then each conduct one of the media.
  • the heat exchanger 1 has at least one spacer 6 via which a first tube layer 201 situated further outward in the radial direction R of the tube bundle 2 is supported against a second tube layer 202 situated further inward in the radial direction R, wherein the spacer 6 has a flow-guiding means 6 a which is configured to divert a part of the first medium S, which part flows along a tube 20 of the first tube layer 201 in the shell space M, into the direction of the further inwardly situated second tube layer 202 .
  • said means 6 a is for example an end side 6 a of the spacer 6 , which end side connects a front side 6 b , averted from the core tube 21 , of the spacer 6 to a rear side 6 c , facing the core tube 21 , of the spacer 6 , wherein said end side 6 a has an inclination toward the second tube layer 202 such that that part of the first medium S which flows along the tube 20 of the first tube layer 201 and against the end side 6 a is diverted by the end side 6 a into the direction of the second tube layer 202 .
  • the inclination of the end side 6 a in relation to the first tube layer 201 is in this case characterized by an acute angle W which the second end side 6 a includes with the second tube layer 202 or with those tube sections of the second tube layer 202 which are adjacent to the spacer 6 .
  • a plurality of spacers 6 of the above-described type is provided between in each case two adjacent tube layers 201 , 202 , . . . , wherein the number of spacers 6 arranged between two tube layers 201 , 202 , . . . is preferably constant and the spacers 6 from different tube layers are preferably arranged one on top of the other in the radial direction R in order that the load of the tube layers 201 , 202 , . . . arranged one on top of the other can be reliably dissipated to the core tube 21 via the spacers 6 .
  • the tubes 20 in the tube layers 201 , 202 , . . . may have a different coiling direction.
  • the result of this is that it is possible for the first medium S to flow in a different direction in the adjacent tube layers 201 , 202 along the respective tube 20 .
  • the end side 6 a of the respective spacer 6 is then oriented such that the respective part of the first medium S which is to be diverted inward flows against the respective end side 6 a.
  • the at least one or the respective spacer 6 may have projections 61 which project outward in the radial direction R from an edge section of a base 60 of the respective spacer 6 .
  • Said projections 61 serve for establishing a desired vertical spacing of the tube coils in the respective tube layer.
  • the projections 61 may form a part of the end side 6 a of the respective spacer 6 .
  • the end side 6 a of the respective spacer 6 may therefore be arranged at least sectionally between the adjacent tube sections of the in each case further outwardly situated tube layer 201 .
  • FIG. 3 shows a further embodiment of the invention, in which the at least one spacer 6 has at least one guiding element 62 , for example in the form of a baffle plate, which is fixed to a (for example web-like) base 60 of the at least one spacer 6 , which base extends along the longitudinal axis L, wherein it is preferably the case here that the base 60 performs the load-dissipating function, that is to say the in each case further outwardly arranged (first) tube layer 201 is supported via said base 60 against the (second) tube layer 202 situated therebelow, while the guiding element 62 preferably performs the flow-guiding or flow-diverting function and forms said means 6 a of the spacer 6 , which here is formed as an impact surface 6 a of the guiding element 62 , said surface having an inclination toward the (second) tube layer 202 situated further inward in the radial direction R (or an inclination in relation to the adjacent tube sections of the second tube layer 202 ), such
  • the guiding element 62 may be a separate element which is fixed to the base 60 of the respective spacer 6 , specifically preferably to an end side 60 a of the base 60 , which end side connects a rear side, which faces the core tube 21 and against which the further inwardly situated (second) tube layer 202 bears, to a front side of the base 60 , against which front side the further outwardly situated (first) tube layer 201 bears.
  • the guiding element 62 may also be formed integrally with the base 60 (from one piece).
  • FIG. 3 also shows a situation in which the flow direction of that part of the first medium S which flows along the tube 20 of the respective tube layer 201 , 202 , . . . is different from tube layer to tube layer owing to the coiling direction of the respective tube 20 , wherein, as per FIG. 3 , it is preferably provided that the respective guiding element 62 is, in relation to the flow direction of that part of the first medium S which is to be diverted, provided on, or fixed to, an end side 60 a of the base 60 of the respective spacer 6 , which end side is situated downstream.
  • said impact surface 6 a in particular faces the respective base 60 and ensures in particular a diversion of a part of the first medium S after said part has passed the respective base 60 on the rear side of the respective base 60 .
  • FIG. 4 shows a modification of the guiding elements 62 , wherein here, in contrast to FIG. 3 , the guiding elements 62 are each provided on an end side 60 a of the base 60 of the respective spacer 6 , which end side is situated upstream, and wherein here the impact surface 6 a of the respective guiding element 62 is averted from the associated base 60 and has, in relation to the in each case further inwardly situated (second) tube layer 202 , an inclination such that it includes an acute angle W with said tube layer.
  • the guiding element 62 of the respective spacer 6 extends sectionally between adjacent tube sections of the in each case further inwardly situated tube layer 202 .
  • the respective spacer 6 it is possible in both embodiments ( FIG. 3 and FIG. 4 ) for the respective spacer 6 also to have a corresponding plurality of guiding elements 62 , which then in each case project into the intermediate space between two adjacent tube sections of the in each case further inwardly arranged tube layer 202 , . . . .
  • FIG. 5 shows an embodiment of spacers 6 according to the invention, which, as before, are arranged between adjacent tube layers 201 , 202 , . . . of the heat exchanger 1 (see above), wherein here the flow-guiding means 6 a is formed by channels 6 a (or has such channels), which are each configured to divert a part of the first medium S, which part flows along the first or outer tube layer 201 from the top downward, into the direction of the second or radially further inwardly situated tube layer 202 .
  • said channels preferably descend to the further inwardly situated (second) tube layer 202 .
  • the channels 6 a may be provided for example on an end side 60 a of the respective spacer 6 or a base of the respective spacer 6 .
  • the spacers 6 may also in turn have projections 61 which project from the respective base 60 in the radial direction R and which define a vertical spacing of adjacent tube coils or adjacent tube sections of the tubes 20 in the direction of the longitudinal axis L of the shell.
  • the spacers 60 may only have said channels 6 a as flow-guiding means. However, said channels 6 a may also be present in the spacers 6 of FIGS. 1 to 4 as additional flow-guiding components.
US16/093,182 2016-04-14 2017-04-12 Helically coiled heat exchanger Active 2037-07-20 US10823508B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP16000851 2016-04-14
EP16000851.2 2016-04-14
EP16000851 2016-04-14
PCT/EP2017/025090 WO2017178120A1 (de) 2016-04-14 2017-04-12 Gewickelter wärmeübertrager

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US20190120559A1 US20190120559A1 (en) 2019-04-25
US10823508B2 true US10823508B2 (en) 2020-11-03

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US16/093,182 Active 2037-07-20 US10823508B2 (en) 2016-04-14 2017-04-12 Helically coiled heat exchanger

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US (1) US10823508B2 (zh)
EP (1) EP3443287B1 (zh)
CN (1) CN108885065B (zh)
RU (1) RU2727110C2 (zh)
WO (1) WO2017178120A1 (zh)

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CN108885065A (zh) 2018-11-23
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WO2017178120A1 (de) 2017-10-19
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EP3443287B1 (de) 2021-12-08
US20190120559A1 (en) 2019-04-25

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